Heliar 15 mm f:4,5

Hi Guys......

Just today I bought a Bessa L with Heliar 15 mm f:4,5 Leica screw mount , related viewfinder and leather case in mint conditiond....for 400 €.....

Is thiis lens as god as described ?

It is the aluminium color version.

There are differences in quality with the black version ?

I shall mount it in my GXR M12 M module.....

I would lke test this lens with my Russian Zenitar 16 mm f:2,8 .

Cheers

Salvatore